Short communicationFasciola hepatica infections in livestock flock, guanacos and coypus in two wildlife reserves in Argentina
Introduction
Fasciola hepatica, the liver fluke, has an indirect life cycle involving domestic and wild herbivorous mammals and humans as definitive hosts, and freshwater gastropods of the Family Lymnaeidae as intermediate hosts (Andrews, 1999). Infections with this parasite give rise to a cosmopolitan zoonotic disease, fascioliasis, which is a food-borne trematodiasis (Torgerson and Claxton, 1999). In farmed livestock the disease causes important economic losses due to liver condemnation, decreased meat, milk and wool production and increased mortality (Dargie, 1987).
In Argentina, fascioliasis is of concern in farmed livestock. Liver condemnation rates at abattoirs can be nearly 80%, with highest values reported for cattle from Patagonia (Kleiman et al., 2007). In this region detailed epidemiological surveys involving both definitive and intermediate hosts have been performed in cattle ranches (Kleiman et al., 2005, Kleiman et al., 2007, Rubel et al., 2005), but as yet there is no information concerning fascioliasis in natural protected areas where animals may, or may not, become infected and play a local role in transmission.
In South America F. hepatica has been reported in two large rodent species: the coypu or false nutria (Myocaster coypus) in Argentina, and the capybara (Hydrochoerus capybara) in Venezuela (cited in Sutton, 1989). South American camelids, e.g. alpacas (Lama pacos) and llamas (Lama glama), are known to be highly susceptible to fascioliasis but generally observed prevalence is low (∼8%) inasmuch as mortality in severe acute infections can be 100% (Leguía, 1991).
In this paper, we report the findings of an epidemiological survey in two wildlife reserves in Argentina and document for the first time active transmission foci of F. hepatica and infection in wildlife.
Section snippets
Material and methods
The study area comprised the Natural Reserves of La Payunia (36°00′S, 68°34′W) and Laguna de Llancanelo (35°45′S, 69°08′W), both located in the Department of Malargüe, Province of Mendoza, northern Patagonia, Argentina. The La Payunia Reserve occupies 450,000 Ha and hosts the largest (about 10,000 heads) wild guanaco (Lama guanicoe) population in the country (Candiar et al., 1993). This camelid has experienced a dramatic population decline in the last 50 years due to severe hunting pressure (
Results
The prevalences and median epg values for the different herbivores analyzed are shown in the Table 1. The Chi-square test revealed significantly different prevalences among sheep, goats, coypus and guanacos (Chi-square = 270, p < 0.05). Further analysis indicated that there were no significant differences in the prevalence of sheep, goats and coypus (Chi-square = 2.6, p < 0.05) while the prevalence of guanacos was significantly lower than those of the remaining herbivores (Chi-square = 267, p < 0.05). The
Discussion
The occurrence of active F. hepatica transmission foci in the reserves of Payunia and LLancanelo was confirmed by the simultaneous presence of L. truncatula snails and infected livestock and wild animals. The reserves appear as areas of very high transmission based on the high prevalences and egg counts obtained from livestock. The occurrence of foci is further favored by the limited availability of water as a resource. Both sheep and goats are very susceptible to F. hepatica, have no
Acknowledgements
We thank the park ranger of Payunia Reserve Mr. Anibal Soto for field assistance. This study was supported by the Universidad de Buenos Aires (Project no. X-246, 2004–2008).
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